[1900k edition is in!] WTS: 1900k-5800k 5mm LED 95+ CRI

Thanks for the test. :slight_smile:

Picked some up a while ago and they look great. Work very well in old mini-mags! I’d actually be very interested in a narrow beam version. I have some photons and some Gerber IU’s that are just begging for a high CRI upgrade!

As far as the situation goes, I only have 19 countries left that can be shipped through regular postal service. All these remaining countries except Russia (and China) must be shipped to via Surface Mail (2-3 Months minimum).

Alternatively, there’s DHL service still available for most countries. The shipping cost for that is from $35 to $100 varying by countries.

Thank you for the 2300K test data. We know that the these flea powered LED’s won’t last too long at 150mA. I would be interested in knowing what the max mA they can handle with no degradation in output for maybe 100+ hours. No joy for me in toasting these little gems. I’m guessing a safe limit may be 75mA or so? For night lights and candelabra the 5-7 lumen range is good, if I need more from them I would add more LED’s.

If you want to run this continuously then keep it at 30-35ma or below. Otherwise, the degradation might become apparent after 1000-2000 hours of operating or so.

For flashlight use, pushing it to 50-80ma range might be okay for occasional use. The loss in output might not become apparent over several years.

You only need 20ma for these to produce 7 lumens.

I finally had a chance to graph my data for the 3400K version.

150mA was too high for this version, but it performed better at 150mA than the 2300K version did at 200mA, so I tried a second sample at 125mA. At this level, performance was very comparable to the 2300K at 150mA. As with the 2300K, this was with the legs trimmed short, installed in a solderless breadboard. Power was by a constant current bench supply.

I view this as also very good performance, although the 2300K seemed to have a slight advantage.

One other 3400K sample failed getting setup for the test. I’m not sure what to do to investigate it further. I was having trouble with a bad connection causing it to flicker on and off. There’s a chance that caused a large transient from my power supply, and regardless, for the price, I’m not worried if I find a few duds.

2300K Baseline: 5.8 lumens at 25mA, 22 lumens at 150mA
3400K Baseline: 7 lumens at 20mA, 22 lumens at 100mA

I’ve got a couple “warm white” nightlights that looked rather green even with no other points of reference. Auto white balance suggests they’re around 2300-2400K.

When I swapped one of these 2300K LED’s in, the difference was stark. They went from one of the worst tinted LED lights I’ve seen to one of the best.

I guess Nitecores Tube exceeds any safe current, right? I made a couple of them but never gave one of them away because I thought high mode could kill the LED if used longer than one minute or so.

My Tube has a 3200K Rngwn led and it is doing fine. I believe I measured it and it came at 80mA (not sure it was 80 but under 100mA for sure), while these little leds are even fine for hours at 100mA. They will not reach 50,000 hours lifetime probably. :wink:

Thanks, djozz. So, now I have some gifts :smiley:

Update: Some countries are opening up as a result of easing the lockdown measures. You can check if your location is eligible here (Last updated June 2).

Surface mail or Surface parcels don’t really count, I tried that a few times and none of the attempts were successful.

Air Parcel post is pretty expensive and will cost you $21 minimum. For U.S. location, it will cost $33 at the current exchange rate.

TL;DR - Standard shipping now available for:

  1. Austria
  2. Belgium
  3. Bhutan
  4. Brazil
  5. Denmark
  6. Estonia
  7. Finland
  8. France
  9. Germany
  10. Greece
  11. Italy
  12. South Korea
  13. Malaysia
  14. Poland
  15. Portugal
  16. Russia
  17. Singapore
  18. Spain
  19. Sweden
  20. Switzerland
  21. UK

Countries not in the TL;DR list will either cost more or must use courier post only.

Btw, the Ledlenser K2 is a candidate for an easy swap. No soldering required. AG13 button cells, unfortunately. Works better than those $2 zinc alloy lights. Something for the car as those cells last forever without leaking. Or exploding. I’ve seen 30yo pocket calculators still running on original AG13.

Made it today while pan was heating up for the i3E emitter swap :smiley:

Any tips/tricks for getting the driver out? I’m doing something wrong apparently, and keep ending up with dead drivers. I’ve had a few swaps work, and a few more that didn’t :frowning:

You need to unsolder the LED first, dk. It is held back by a plastic retainer.

Thanks! I’ve tried that, and I’ve also tried carefully working and angling the PCB/driver up sideways, then unscrewing the retaining ring and desoldering. I guess my soldering must just suck and I’m doing something to the boards, they seem to die easily.

Maybe I was just lucky with my three lights. I’m holding light and screwdriver with the left hand, soldering iron with the right. Blade of the screwdriver levers the PCB while the iron tip melts the solder.

I imagine that the copper contacts could be ripped of the PCB when levering it without solder being completely melted. I’m using lots of heat for very short period of time instead of trying to keep the iron as cool as possible but needing more time melting the solder. Half a second up to a second contact between tip and joint at most.

But: I’m very far from being an expert in soldering. Just the opposite!

Thanks for the tips. Are you working the PCB up little by little each time you use the iron, or are you doing one contact fully up, then the next fully up? Also when you do this method, do you end up with solder blocking the holes for the LED leads? if so how do you handle that?

Thanks for taking the time to explain. Just trying to see where I’m going wrong here, and I haven’t come across many others working on these lights.

Yes it takes two or three iterations at most per pin. And sometimes the hole is blocked, so when resoldering, I just press the LED pins onto the solder and heat it up to get them through. No magic on my side :wink:

I did a write up a couple years back when I modded one. This doesn’t necessarily tell much beyond what has been said here, but you might give it a look:

I clamped the head in a hobby vice while desolding the PCB, then clamped the PCB in a “3rd hand” tool while desoldering the LED.

Good luck.

By the way, a while back, it was possible to order spare Sofirn C01 drivers on request. I don’t know if they are still available, or even if the driver would fit in the R01A, but if you have some dead drivers, perhaps it is possible to replace them.

Actually your write up is what drove me towards the R01A as the host for this swap. I had started with the Nitecore Tube, but like everyone says, that died after about a month. Thanks all again for the info!

Edit: Turns out the Nitecore was fine. Poor solder joint came undone, possibly by sitting on it. Not exactly a fault of the light.